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Scenario #29
Cluster Management
K8s v1.24, custom scheduler deployment
kube-scheduler Crash Due to Invalid Leader Election Config
kube-scheduler pod failed with panic due to misconfigured leader election flags.
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What Happened
An override in the Helm chart introduced an invalid leader election namespace, causing the scheduler to panic and crash on startup.
Diagnosis Steps
- 1Pod logs showed panic: cannot create leader election record.
- 2Checked Helm values – found wrong namespace name.
Root Cause
Namespace specified for leader election did not exist.
Fix/Workaround
• Created the missing namespace.
• Restarted the scheduler pod.Lessons Learned
Leader election is sensitive to namespace scoping.
How to Avoid
- 1Use default kube-system unless explicitly scoped.
- 2Validate all scheduler configs with CI linting.